On Fri, Jul 12, 2019 at 1:50 PM Igor Opaniuk igor.opaniuk@gmail.com wrote:
i.MX 7's Cortex-M4 core can run from DDR and uses DDR memory for the rpmsg communication. Both use cases need a fixed location of memory reserved. For the rpmsg use case the reserved area needs to be in sync with the kernel's hardcoded vring descriptor location.
Introduce support for adding linux,usable-memory property to carve out 1MB of memory in case the M4 core is running. Also make sure that the i.MX 7 specific rpmsg driver does not get loaded in case we do not carve out memory.
Igor Opaniuk (2): common: fdt_support: add support for setting usable memory board: colibri_imx7: reserve DDR memory for Cortex-M4
arch/arm/include/asm/mach-imx/sys_proto.h | 2 ++ board/toradex/colibri_imx7/colibri_imx7.c | 37 +++++++++++++++++++++++ common/fdt_support.c | 35 +++++++++++++++++++++ include/fdt_support.h | 2 ++ 4 files changed, 76 insertions(+)
-- 2.17.1
Please, don't pay attention to "android" keyword in the title (actually nothing related to android), it's just a glitch. -- Best regards - Freundliche Grüsse - Meilleures salutations
Igor Opaniuk
mailto: igor.opaniuk@gmail.com skype: igor.opanyuk +380 (93) 836 40 67 http://ua.linkedin.com/in/iopaniuk